1156261155 has 16 divisors (see below), whose sum is σ = 2114306304. Its totient is φ = 528576480.

The previous prime is 1156261133. The next prime is 1156261193. The reversal of 1156261155 is 5511626511.

It is not a de Polignac number, because 1156261155 - 2¹² = 1156257059 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5505901 + ... + 5506110.

It is an arithmetic number, because the mean of its divisors is an integer number (132144144).

Almost surely, 2^1156261155 is an apocalyptic number.

1156261155 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1156261155 is a deficient number, since it is larger than the sum of its proper divisors (958045149).

1156261155 is a wasteful number, since it uses less digits than its factorization.

1156261155 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11012026.

The product of its digits is 9000, while the sum is 33.

The square root of 1156261155 is about 34003.8402978252. The cubic root of 1156261155 is about 1049.5874887525.

Adding to 1156261155 its reverse (5511626511), we get a palindrome (6667887666).

The spelling of 1156261155 in words is "one billion, one hundred fifty-six million, two hundred sixty-one thousand, one hundred fifty-five".